
Beast and Man: The Roots of Human Nature (1979).
Beast and Man: The Roots of Human Nature (1979).
Commencement Address at Middlebury College May, 2001 http://web.archive.org/web/20030906163501/http://www.middlebury.edu/offices/pubaff/general_info/addresses/Fred_Rogers_2001.htm
Seminar at LeSEA Broadcasting Studios in South Bend, Indiana http://www.christianitytoday.com/music/interviews/2003/richmullins-hiatranscript1.html (February 1993)
Robert Fogel in: " Early Retirees Turn to Volunteer Work http://www.npr.org/templates/story/story.php?storyId=4970476," at npr.org. October 23, 2005.
Chap. 7 : Soften People’s Resistance by Confirming Their Self-opinion
The Laws of Human Nature (2018)